[sdiy] A20G545 chip, what is it?

John Speth johnspeth at yahoo.com
Sun Jun 19 13:51:58 CEST 2022


 There is no logo. The board is my own design and hand-wired construction so the SSM chips will not necessarily indicate function. It is unfinished so I can't even get any clues about what pins were used. Only the power pins were wired in. I guess it will remain a mystery. - JJS
    On Saturday, June 18, 2022, 10:32:02 PM PDT, Michael E Caloroso <mec.forumreader at gmail.com> wrote:  
 
 Is there a manufacturer's logo on the ICs?  Post a pic?
I have lots of databooks from the 80s.  If the logo can be identified that narrows it down.

MC
On Sat, Jun 18, 2022 at 11:04 PM John Speth via Synth-diy <synth-diy at synth-diy.org> wrote:

Today I was dumping old circuit boards that I built many years ago. I was stripping valuable parts from one and I found two 18 pin DIPs that are marked "A20G545" on one line and "MCE 8211" on the line below it. 8211 is the date code (1982). The other markings are a mystery. Searching for this chip online was a dead end for me. Does anybody know what it could be? It was from a board that contained an SSM 2012 VCA and an SSM 2044 VCF. I've lost the schematics. It was my design.
Thanks - JJS_______________________________________________
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